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3M

3M Foil Tape 3340, Silver, 2 1/2 in x 50 yd, 3.9 mil

SKU:3M-7100189974
When sealing ducts and other surfaces for heating, ventilation and air conditioning systems (HVAC), it's essential to have a strong, long-lasting foil tape that can stand up well to hot and cold temperatures. The 3M™ Foil Tape 3340 has the combination of 2.0 mil aluminum foil backing and strong, pressure sensitive acrylic adhesive that gives our tape a superb operational temperature range of -40°F (-40°C) to 300°F (149°C) making it ideal for sealing rigid fiberglass duct boards and flexible air duct systems. The foil backing also serves as an excellent barrier against moisture, dust and many chemicals — making it strong, durable and long-lasting. The very low moisture vapor transmission rate makes the tape a good sealant and the acrylic adhesive supplies superior temperature and UV resistance to give you a strong, lasting and reliable bond. It also has an easy releasing poly coated kraft paper liner to protect the adhesive and keep the tape ready for use. 3340 tape meets requirements for UL 181 A-P and UL 181 B-FX Listings as a measure of reliability and quality standards. 3M™ Foil Tape 3340 is used in a variety of applications including heating ventilation air conditioning (HVAC), duct closure, vapor seal on reinforced fiberglass duct board, rigid fiber glass duct board, and flexible air ducts and air connectors across a number of industries, including: transportation, specialty vehicle, metalworking, construction, automotive, military and government, general industrial, MRO, electronics and aerospace.
$561.97

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More Info
Ideal for sealing rigid, fiberglass ductboard systems and flexible, non-metallic air ducts Our 3M™ Foil Tape 3340 is constructed using a 2.0 mil aluminum foil backing with a strong, pressure sensitive acrylic adhesive for long-term adhesion, along with an easy releasing poly coated kraft paper liner to protect the adhesive and keep the tape ready for use. The highly engineered aggressive acrylic adhesive performs in both cold and hot temperature conditions. Recommended Applications Heating Ventilation Air Conditioning (HVAC) Duct closure Vapor seal on reinforced fiberglass duct board For use with rigid fiber glass duct board For use with flexible air ducts and air connectors Superb Temperature Resistance When sealing ducts and other surfaces for heating, ventilation and air conditioning systems, it's essential to have a strong, long-lasting foil tape that can stand up well to hot and cold temperatures. The 3M™ Foil Tape 3340 has the combination of a foil backing and acrylic adhesive that gives our tape a superb operational temperature range of -40°F (-40°C) to 300°F (149°C). The benefits don't end there; the foil backing also serves as an excellent barrier against moisture, dust and many chemicals — making it strong, durable and long-lasting. The very low moisture vapor transmission rate makes the tape a good sealant and the acrylic adhesive supplies superior temperature and UV resistance to give you a strong, lasting and reliable bond. 3M™ Foil Tape 3340 is used in a variety of applications across a number of industries, including: transportation, specialty vehicle, metalworking, construction, automotive, military and government, general industrial, MRO, electronics and aerospace.

Brand

3M

GTIN

00638060401323

Manufacturer

3M

MPN

7100189974

Unit of Measure

Case of 20 Rolls

Delivery

We can ship to virtually any address in the US. At this time products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

We offer FREE Standard Shipping on all orders (excl. heavy, bulk & over-sized items) when you spend a minimum of $95.00 in a single transaction

$15.00 standard flat rate shipping on all orders (excl. heavy, bulk & over-sized items) when you spend less than $95.00 in a single transaction.

$79.95 standard flat rate shipping on all orders for heavy, bulk or over-sized items.

Shipping costs are automatically applied at checkout based on your total order value (excluding shipping costs) and the items in your order.

Returns Policy

Some items may be returned if new, unopened items and within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.). However, many safety items are unable to be returned once shipped because these items are unable to be resold due to chain of custody being broken and thereby assurance of the products fit for purpose. You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days). If you need to return an item, please Contact Us or email us at marketplace.us.orders@safetyculture.com with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.

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June 2025